linux-kernel - Re: [PATCH] ARM: tegra: add basic SecureOS support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 6 Jun 2013 17:56:53 +0530
From:	Jassi Brar <jassisinghbrar@...il.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Joseph Lo <josephl@...dia.com>,
	Karan Jhavar <kjhavar@...dia.com>,
	Varun Wadekar <vwadekar@...dia.com>,
	Chris Johnson <CJohnson@...dia.com>,
	Matthew Longnecker <MLongnecker@...dia.com>, gnurou@...il.com,
	devicetree-discuss@...ts.ozlabs.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-tegra@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: tegra: add basic SecureOS support

On Thu, Jun 6, 2013 at 12:58 PM, Alexandre Courbot <acourbot@...dia.com> wrote:
> Boot loaders on some Tegra devices can be unlocked but do not let the
> system operate without SecureOS. SecureOS prevents access to some
> registers and requires the operating system to perform certain
> operations through Secure Monitor Calls instead of directly accessing
> the hardware.
>
IOW, some critical h/w controls on Tegra are accessible only from
Secure mode (not unusual). So if we(Linux) run in NS mode we need to
make calls to the SecureOS, over SMC, to do things for us?

> This patch introduces basic SecureOS support for Tegra. SecureOS support
> can be enabled by adding a "nvidia,secure-os" property to the "chosen"
> node of the device tree.
>
Probably just a nit, but shouldn't it be "nvidia,nonsecure-os"
instead, denoting the mode Linux is going to run?  (and then I wonder
if we could detect the mode (S or NS) at runtime and avoid this flag
at all).

Cheers,
-Jassi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/